From 0135904f7d3e1c0e763adaefe267c736616e3d26 Mon Sep 17 00:00:00 2001
From: Christopher Speller <crspeller@gmail.com>
Date: Wed, 16 Nov 2016 19:28:52 -0500
Subject: Upgrading server dependancies (#4566)

---
 vendor/golang.org/x/crypto/ocsp/ocsp.go | 85 ++++++++++++++++++++++++---------
 1 file changed, 63 insertions(+), 22 deletions(-)

(limited to 'vendor/golang.org/x/crypto/ocsp/ocsp.go')

diff --git a/vendor/golang.org/x/crypto/ocsp/ocsp.go b/vendor/golang.org/x/crypto/ocsp/ocsp.go
index 09367c0b7..2c7e57a0b 100644
--- a/vendor/golang.org/x/crypto/ocsp/ocsp.go
+++ b/vendor/golang.org/x/crypto/ocsp/ocsp.go
@@ -266,6 +266,15 @@ func getHashAlgorithmFromOID(target asn1.ObjectIdentifier) crypto.Hash {
 	return crypto.Hash(0)
 }
 
+func getOIDFromHashAlgorithm(target crypto.Hash) asn1.ObjectIdentifier {
+	for hash, oid := range hashOIDs {
+		if hash == target {
+			return oid
+		}
+	}
+	return nil
+}
+
 // This is the exposed reflection of the internal OCSP structures.
 
 // The status values that can be expressed in OCSP.  See RFC 6960.
@@ -305,6 +314,32 @@ type Request struct {
 	SerialNumber   *big.Int
 }
 
+// Marshal marshals the OCSP request to ASN.1 DER encoded form.
+func (req *Request) Marshal() ([]byte, error) {
+	hashAlg := getOIDFromHashAlgorithm(req.HashAlgorithm)
+	if hashAlg == nil {
+		return nil, errors.New("Unknown hash algorithm")
+	}
+	return asn1.Marshal(ocspRequest{
+		tbsRequest{
+			Version: 0,
+			RequestList: []request{
+				{
+					Cert: certID{
+						pkix.AlgorithmIdentifier{
+							Algorithm:  hashAlg,
+							Parameters: asn1.RawValue{Tag: 5 /* ASN.1 NULL */},
+						},
+						req.IssuerNameHash,
+						req.IssuerKeyHash,
+						req.SerialNumber,
+					},
+				},
+			},
+		},
+	})
+}
+
 // Response represents an OCSP response containing a single SingleResponse. See
 // RFC 6960.
 type Response struct {
@@ -402,6 +437,18 @@ func ParseRequest(bytes []byte) (*Request, error) {
 // Invalid signatures or parse failures will result in a ParseError. Error
 // responses will result in a ResponseError.
 func ParseResponse(bytes []byte, issuer *x509.Certificate) (*Response, error) {
+	return ParseResponseForCert(bytes, nil, issuer)
+}
+
+// ParseResponseForCert parses an OCSP response in DER form and searches for a
+// Response relating to cert. If such a Response is found and the OCSP response
+// contains a certificate then the signature over the response is checked. If
+// issuer is not nil then it will be used to validate the signature or embedded
+// certificate.
+//
+// Invalid signatures or parse failures will result in a ParseError. Error
+// responses will result in a ResponseError.
+func ParseResponseForCert(bytes []byte, cert, issuer *x509.Certificate) (*Response, error) {
 	var resp responseASN1
 	rest, err := asn1.Unmarshal(bytes, &resp)
 	if err != nil {
@@ -429,7 +476,7 @@ func ParseResponse(bytes []byte, issuer *x509.Certificate) (*Response, error) {
 		return nil, ParseError("OCSP response contains bad number of certificates")
 	}
 
-	if len(basicResp.TBSResponseData.Responses) != 1 {
+	if n := len(basicResp.TBSResponseData.Responses); n == 0 || cert == nil && n > 1 {
 		return nil, ParseError("OCSP response contains bad number of responses")
 	}
 
@@ -460,7 +507,13 @@ func ParseResponse(bytes []byte, issuer *x509.Certificate) (*Response, error) {
 		}
 	}
 
-	r := basicResp.TBSResponseData.Responses[0]
+	var r singleResponse
+	for _, resp := range basicResp.TBSResponseData.Responses {
+		if cert == nil || cert.SerialNumber.Cmp(resp.CertID.SerialNumber) == 0 {
+			r = resp
+			break
+		}
+	}
 
 	for _, ext := range r.SingleExtensions {
 		if ext.Critical {
@@ -512,8 +565,7 @@ func CreateRequest(cert, issuer *x509.Certificate, opts *RequestOptions) ([]byte
 	// OCSP seems to be the only place where these raw hash identifiers are
 	// used. I took the following from
 	// http://msdn.microsoft.com/en-us/library/ff635603.aspx
-	var hashOID asn1.ObjectIdentifier
-	hashOID, ok := hashOIDs[hashFunc]
+	_, ok := hashOIDs[hashFunc]
 	if !ok {
 		return nil, x509.ErrUnsupportedAlgorithm
 	}
@@ -538,24 +590,13 @@ func CreateRequest(cert, issuer *x509.Certificate, opts *RequestOptions) ([]byte
 	h.Write(issuer.RawSubject)
 	issuerNameHash := h.Sum(nil)
 
-	return asn1.Marshal(ocspRequest{
-		tbsRequest{
-			Version: 0,
-			RequestList: []request{
-				{
-					Cert: certID{
-						pkix.AlgorithmIdentifier{
-							Algorithm:  hashOID,
-							Parameters: asn1.RawValue{Tag: 5 /* ASN.1 NULL */},
-						},
-						issuerNameHash,
-						issuerKeyHash,
-						cert.SerialNumber,
-					},
-				},
-			},
-		},
-	})
+	req := &Request{
+		HashAlgorithm:  hashFunc,
+		IssuerNameHash: issuerNameHash,
+		IssuerKeyHash:  issuerKeyHash,
+		SerialNumber:   cert.SerialNumber,
+	}
+	return req.Marshal()
 }
 
 // CreateResponse returns a DER-encoded OCSP response with the specified contents.
-- 
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